I like being around people who believe. I find their optimism about an imagined better future because of what they are building is a huge motivator for me.
Optimism is power. I imagine some of the worst hardships – solitary confinement: optimistic people tend to succeed because they believe that everything will turn out right and the expectation of success makes them work harder. Great leaders also have an unusual ability to face up to stark reality, so creating a single powerful attribute: tough-minded optimism.